My 5er is a 2015 36QBQ Heritage Glen, identical to the Hemisphere.
When I bought the 5er, the grill didn't look quite right, so the dealer replaced it. The replacement unit didn't have the right mounts for the arm, even though the grill itself was correct. The dealer said that was the one that showed as the replacement unit, and he couldn't fix the problem (he supposed it is a China made unit and so do I)
Anyway, after cooking on the grill once, I decided that the quality that FR specs is really really low. So, I took off the arm, and have decided to buy a stainless unit which I can buy at Sams club for about $100.
But a note about the arm. It is a massively overbuilt arm, and weighs at least 60 pounds. After thinking about it, why would I want to haul that extra weight around, plus the grill? Also, it is subject to road hazards, dirt, theft, etc.
I get the convenience factor, with it being by the kitchen, and it hooks directly to the propane access point under the kitchen. But I probably will never use that grill again. It's just that bad...and I think FR puts them there as a selling point, not as something that is really that useful
So bottom line for me anyway is to take off the arm, make the bumper not look so patched together (which IMHO it is with this thing hanging off it), and use a stainless, good looking grill that I will lift out of storage when I want it.